Hasan, Nabaa N, and Zainab John. “Analytic Approach for Solving System of Fractional Differential Equations”. Al-Mustansiriyah Journal of Science 32, no. 1 (February 24, 2021): 14–17. Accessed May 5, 2024. https://mjs.uomustansiriyah.edu.iq/index.php/MJS/article/view/929.